Read the Husky Hook's Path List Once, Diff a Merge Against MERGE_HEAD, and Drop the LF Pin by ptr727 · Pull Request #4132 · ptr727/ProjectTemplate · GitHub
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Read the Husky Hook's Path List Once, Diff a Merge Against MERGE_HEAD, and Drop the LF Pin - #4132
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Summary
The path list is read once and its read is checked (The Husky Snippet's Prose Gate Skips Silently When Its Second git diff Fails #4122). Both the hub's own .husky/pre-commit and catalog/snippets/husky/pre-commit ran git diff --cached --name-only twice: a checked preflight, then an unchecked second run piped into xargs. Under POSIX sh a failure of the second run reached the gate as an empty list, which skips it. The list now goes to a mktemp file whose write is checked, and xargs reads that file. An EXIT trap removes it, and INT/TERM traps print one line and exit 130/143 so the EXIT trap runs under dash too.
The snippet diffs a merge commit against MERGE_HEAD (Judge a Merge Commit's Resolution, Not Its Merged-In Lines, in the Pre-Commit Prose Gate #4104). It now picks its base the way the hub's own hook already does, so the lines a merged-in parent brought are not read as added. After merging the target branch in, MERGE_HEAD is the merge base the pull request gate reads, so the hook and CI read the same lines. The issue floated the merge base of HEAD and MERGE_HEAD. That base would read the merged-in parent's own lines as added, which is the defect itself.
The snippet README drops the per-file LF pin (The Husky Snippet README Asks for a Per-File LF Pin That recurring.eol Forbids #4121). The paired LF defaults recurring.eol requires already give the hook LF. Only a repository whose two defaults are CRLF pins it. The hub hook's header line naming "the line-ending pins" is removed with it.
Tests.tests/test_pre_commit_hook.py now runs every case against both hooks. New cases fail the first or the second list read through a git stub and assert the commit is refused, and signal the hook mid-gate and assert the 130/143 status with the list file gone. Against the develop hooks, eight of the new or re-run cases fail. Against this branch, all 24 pass.
.husky/pre-commit:52-65 and catalog/snippets/husky/pre-commit:52-65, design (one primitive per defect class): the local pass suggested moving the base choice and the staged-list read into a prose_lint.py option. That file is a carried gate outside this change's scope, and the new option would change its interface. The two hooks already carried the same list read and xargs filter side by side before this change. Diff a Merge Commit Against MERGE_HEAD in the pre-commit Framework Snippet's Prose Gate #4131 records the prose_lint.py shape as the fix that would also reach the framework config.
…, and Drop the LF Pin
The prose gate's path list now goes to a temporary file whose write is checked, so a failed
list refuses the commit rather than reaching the gate as an empty list and skipping it. Both
the hub's own hook and the catalog snippet read the list twice before, checking only the read
that did not feed the gate. The file is removed on exit and on SIGINT or SIGTERM.
The snippet now diffs a merge commit against MERGE_HEAD, as the hub's own hook already does,
so the lines a merged-in parent brought are not read as added.
The snippet README no longer asks for a per-file LF pin the paired LF defaults already cover.
The hook tests now run against both hooks, and cover a failed list read and an interrupt.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Walkthrough
Both pre-commit hooks now use temporary files for staged-path lists and clean them up on exit. The Husky snippet selects MERGE_HEAD for merge commits and runs the prose gate on remaining working-tree files. Tests cover both hooks, including failures and signals.
Changes: Pre-commit prose gates
Layer / File(s)
Summary
Hook path handling and line-ending guidance .husky/pre-commit, catalog/snippets/husky/pre-commit, catalog/snippets/husky/README.md
The hooks store staged paths in temporary files, clean them up, and report SIGINT or SIGTERM with the corresponding exit status. The snippet selects MERGE_HEAD for merge commits, filters paths to working-tree files, and passes the selected base to the prose gate. The README documents when LF pins are needed.
Hook fixtures and behavior tests tests/test_pre_commit_hook.py
The tests run both hooks in temporary repositories. They check merge behavior, staged-path filtering, failed path-list reads, temporary-file cleanup, and SIGINT and SIGTERM handling.
Issue 4122: The snippet now reads the staged path list into a temporary file and fails if that read fails.
Issue 4123: The hooks now handle SIGINT and SIGTERM with exit statuses 130 and 143.
Issue 4121: The README removes the instruction to always add a per-file LF pin.
Issue 4104: The snippet now uses MERGE_HEAD as the diff base for merge commits.
Merge Risk: Minimal · up to e2837
This change makes the pre-commit prose gate more robust: a failed staged-path read now refuses the commit instead of passing an empty list, merge commits are diffed against MERGE_HEAD, and temporary files are cleaned up on exit or interrupt. No merge-blocking risk was found. The author-reported pre-existing issue in the framework config is tracked separately as #4131.
Pre-merge checks: 4
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Title check
The title names the main changes in the PR: the hook reads the staged path list once, the snippet diffs merges against MERGE_HEAD, and the LF pin is removed. The raw summary and objectives confirm eac…
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The title names the main changes in the PR: the hook reads the staged path list once, the snippet diffs merges against MERGE_HEAD, and the LF pin is removed. The raw summary and objectives confirm each of these changes, so the title matches the changeset. It is long (17 words) but specific and not vague.
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Reviewing files that changed from the base of the PR and between fa06887 and e2837ea.
Files selected for processing: 4
.husky/pre-commit
catalog/snippets/husky/README.md
catalog/snippets/husky/pre-commit
tests/test_pre_commit_hook.py
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A recorded local strict-review pass covers head e2837ea124bf5bd8b45e1af2e94b40f32c762431, the content this pull request carries at that commit against develop, and it recorded 2 findings.
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🟡 Changes recommended
The change still has active moderate issues because the SIGINT/SIGTERM traps can exit the hook without terminating and waiting for the foreground prose-gate child, allowing it to outlive the commit.
This PR hardens both Husky pre-commit hooks by making staged-path handling reliable, aligning merge-commit diffing, and updating the snippet's line-ending guidance.
Changes:
Capture the staged path list once and clean it up on exit.
Diff merge commits against MERGE_HEAD.
Remove the unnecessary per-file LF pin guidance.
Expand tests across both hook implementations and interruption scenarios.
File
Description
tests/test_pre_commit_hook.py
Extends coverage to both hooks, including merge behavior, failed path-list reads, cleanup, and signal handling.
catalog/snippets/husky/README.md
Removes the unnecessary per-file LF pin guidance in favor of the repository-wide defaults.
catalog/snippets/husky/pre-commit
Updates staged-path capture, merge-aware diffing, cleanup, and signal handling for the Husky snippet.
.husky/pre-commit
Updates the repository hook's staged-path capture, merge-aware diffing, cleanup, and signal handling.
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… Rules (#4189)
## Summary
Promotes the backlog-burndown rounds and changes from other hub sessions
from `develop` to `main`.
- Hooks and the prose gate: #4132, #4134, #4136, #4145, #4152, #4184.
The Husky hook reads its path list once and diffs a merge against
`MERGE_HEAD`. Interrupts re-raise their signal, a Markdown code span
reads as quoted data, and the gate picks a commit's diff base and
recognizes a conflicted promotion's branch cut from `main`.
- Procedures and carried rules: #4133, #4139, #4141, #4149, #4166,
#4177, #4179, #4183, #4185. Resync, audit and check-this-repo procedure
gaps, code style and shell interrupt rules, review-loop gaps across four
skills, the context and delegation section of `AGENTS.md`, question
rules in governance, the promotion line in pull request bodies,
closing-keyword behavior on promotion, and the history-rewrite premise.
- Review and cleanup tooling: #4138, #4148, #4154, #4156, #4157, #4163,
#4164, #4168, #4174, #4180. Cleanliness reads, parked handoffs, the
backlog report's JSON output, exact inline script pins, trusted inputs,
env-file includes, the bounded review wait, side-reviewer matching, and
a Copilot billing-failure notice read as a refusal.
- Workflow and runbook contract: #4153, #4155, #4169, #4171, #4178,
#4182. The runtime-secrets check, a registry entry and spec references,
the Copilot runbook pointers, credential-free checkout steps, and the
deploy-key and runner wording.
- From other hub sessions: #4159 (a repository's own .NET line under a
fleet default), #4161 (the 1Password CLI as an optional host tool),
#4162 (Codex's Windows installer and one managed opencode copy). These
carry no promotion line.
#4182 carries no promotion line by design, and #4175 holds the split-out
part of #4057's scope. Both #1448 and #4175 stay open.
Fixes#1071Fixes#1154Fixes#1391Fixes#1471Fixes#1594Fixes#1620Fixes#1627Fixes#1650Fixes#1801Fixes#2853Fixes#3620Fixes#3668Fixes#3697Fixes#3766Fixes#3787Fixes#3837Fixes#3840Fixes#3842Fixes#3844Fixes#3865Fixes#3882Fixes#3890Fixes#3894Fixes#3912Fixes#3916Fixes#3954Fixes#4014Fixes#4015Fixes#4016Fixes#4043Fixes#4050Fixes#4057Fixes#4058Fixes#4062Fixes#4084Fixes#4097Fixes#4098Fixes#4099Fixes#4104Fixes#4108Fixes#4114Fixes#4115Fixes#4117Fixes#4118Fixes#4119Fixes#4121Fixes#4122Fixes#4123Fixes#4131Fixes#4135Fixes#4140Fixes#4142Fixes#4143Fixes#4144Fixes#4151
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commentsPermits the comment lines the pull request adds or edits, which the prose gate otherwise refuses
2 participants
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ptr727
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Summary
.husky/pre-commitandcatalog/snippets/husky/pre-commitrangit diff --cached --name-onlytwice: a checked preflight, then an unchecked second run piped intoxargs. Under POSIXsha failure of the second run reached the gate as an empty list, which skips it. The list now goes to amktempfile whose write is checked, andxargsreads that file. AnEXITtrap removes it, andINT/TERMtraps print one line and exit 130/143 so theEXITtrap runs under dash too.MERGE_HEAD(Judge a Merge Commit's Resolution, Not Its Merged-In Lines, in the Pre-Commit Prose Gate #4104). It now picks its base the way the hub's own hook already does, so the lines a merged-in parent brought are not read as added. After merging the target branch in,MERGE_HEADis the merge base the pull request gate reads, so the hook and CI read the same lines. The issue floated the merge base ofHEADandMERGE_HEAD. That base would read the merged-in parent's own lines as added, which is the defect itself.recurring.eolrequires already give the hook LF. Only a repository whose two defaults are CRLF pins it. The hub hook's header line naming "the line-ending pins" is removed with it.tests/test_pre_commit_hook.pynow runs every case against both hooks. New cases fail the first or the second list read through agitstub and assert the commit is refused, and signal the hook mid-gate and assert the 130/143 status with the list file gone. Against the develop hooks, eight of the new or re-run cases fail. Against this branch, all 24 pass.Pre-existing findings, filed
catalog/snippets/pre-commit/.pre-commit-config.yaml:36, correctness: thepre-commitframework config still diffs a merge commit againstHEAD, the Judge a Merge Commit's Resolution, Not Its Merged-In Lines, in the Pre-Commit Prose Gate #4104 class at its third site. Filed as Diff a Merge Commit Against MERGE_HEAD in the pre-commit Framework Snippet's Prose Gate #4131.Local review findings declined
.husky/pre-commit:52-65andcatalog/snippets/husky/pre-commit:52-65, design (one primitive per defect class): the local pass suggested moving the base choice and the staged-list read into aprose_lint.pyoption. That file is a carried gate outside this change's scope, and the new option would change its interface. The two hooks already carried the same list read andxargsfilter side by side before this change. Diff a Merge Commit Against MERGE_HEAD in the pre-commit Framework Snippet's Prose Gate #4131 records theprose_lint.pyshape as the fix that would also reach the framework config.Closes on promotion: #4122, #4104, #4121
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Summary by CodeRabbit
Bug Fixes
Documentation